I get little piles of white crystal when using frozen trim and making light passes with the card yet this stuff still just burns. I first use an initial seperation with a broken 220u work bag stretched over a bowl. Freeze this for a half an hour, card it for 3-4 minutes in the box then back into the freezer and repeat. I make about 6 full swipes back and fourth in this time period. then gently swipe the small collection on the next screen. Thats just one method I tried unsuccessfully to get clear dome sift. But if you need some kind of special training to use it as you imply, which is beyond what ever Im doing, (I only spent hours on this site before I decided to get this item) then that should be clairified to other potential buyers of the bubble box.